A fluorescent alternative copolymer combined energy transfer and charge transfer with large and tunable Pseudo-Stokes shift
A fluorescent alternative copolymer combined energy transfer and charge transfer with large and tunable Pseudo-Stokes shift
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DOI：
10.1016/j.polymer.2021.123477
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发表时间：
2021-03
期刊：
影响因子：
4.6
通讯作者：
Yan Yu;Xitian Li;Yongjie Yuan;Hailiang Zhang
中科院分区：
文献类型：
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作者：
Yan Yu;Xitian Li;Yongjie Yuan;Hailiang Zhang
具有足够大斯托克斯位移（>100 nm）的荧光材料在光转换农膜、细胞成像、化学传感等方面具有广泛的前景。然而，大多数传统荧光染料表现出较小的斯托克斯位移，这严重限制了它们的应用。本文开发了一种名为P(DMPNI-alt-TPE)的侧链替代共聚物，其中两个荧光团彼此相邻：AIE活性四苯乙烯(TPE)充当能量供体，而具有分子内电荷转移(ICT)特性的萘酰亚胺衍生物(DMPNI)作为能量受体。由于这种独特的结构，该共聚物结合了高效的暗/荧光共振能量转移（DRET/FRET）和极性敏感性。因此，它在溶液和聚集状态下分别显示出高达 304 nm 和 302 nm 的令人印象深刻的大伪斯托克斯位移。有趣的是，随着水含量的增加，该共聚物在一系列 THF 溶液中表现出 V 形荧光变化曲线。此外，P(DMPNI-alt-TPE)在不同溶剂中在紫外光照射下发出不同颜色的荧光，其伪斯托克斯位移不仅大而且可调，变化范围为262至304 nm。最后，研究了P(DMPNI-alt-TPE)作为光转换农膜的潜在可能性。该研究为开发具有大且可调谐斯托克斯位移的荧光材料提供了新途径。
Fluorescent materials with a large enough Stokes shift (>100 nm) have widely prospect in light conversion agricultural film, cell-imaging, chemosensory and so on. However, most of traditional fluorescent dyes displayed small Stokes shifts which severely limited their application. In this paper, a side-chain alternative copolymer named P(DMPNI-alt-TPE) was developed, in which the two fluorophores were next to each other: the AIE-active tetraphenylethene (TPE) acted as energy donor, while naphthalimide derivative (DMPNI) with intramolecular charge transfer (ICT) character as energy acceptor. Attributed to this unique structure, the copolymer combined efficient dark/fluorescence resonance energy transfer (DRET/FRET) and polarity-sensitivity. And therefore it showed impressive large pseudo-Stokes Shift up to 304 nm and 302 nm in solution and aggregative state respectively. Interestingly, this copolymer exhibited a V-shaped fluorescence variation curve in a series of THF solutions with increasing fraction of water. Moreover, P(DMPNI-alt-TPE) emitted different color fluorescence in various solvents upon UV light, so that its pseudo-Stokes shift was not only large but also tunable, and the changing range was from 262 to 304 nm. Lastly, the potential possibility of P(DMPNI-alt-TPE) as light conversion agricultural film was investigated. This research provided a new approach for the development of fluorescence materials with large and tunable Stokes shift.